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http://dx.doi.org/10.7582/GGE.2018.21.2.112

Improvement of Migration Image for Ocean-bottom Seismic Data using Wavefield Separation and Mirror Imaging  

Lee, Ganghoon (Department of Energy Resources Engineering, Inha University)
Pyun, Sukjoon (Department of Energy Resources Engineering, Inha University)
Publication Information
Geophysics and Geophysical Exploration / v.21, no.2, 2018 , pp. 112-124 More about this Journal
Abstract
Ocean-bottom seismic survey is a seismic acquisition technique which measures data by installing 4-component receiver on the sea floor. It can produce more improved data in quality than any other acquisition techniques. In the ocean-bottom seismic survey, however, the number of receivers is limited due to high cost. Since only a small number of receivers are used for acquisition, ocean-bottom seismic data may suffer from discontinuities of events over traces, which can result in spatial aliasing. In this paper, we implemented Kirchhoff migration using mirror-imaging algorithm to improve the quality of ocean-bottom seismic image. In order to implement the mirror imaging algorithm, the seismograms should be separated into up-going and down-going wavefields and the down-going wavefield should be used for migration. In this paper, we use the P-Z summation method to separate the wavefield. Numerical examples show that the migration results using mirror imaging algorithm have wider illumination than the conventional migration, especially in the shallow layers.
Keywords
P-Z summation; mirror imaging; down-going wavefield; Kirchhoff migration;
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